Every tank is different. The same goes for the fish. Just because one fish acts aggressive in one tank does not mean all fish of the same species will do that in other tanks. There is no hard and fast rule when it comes to captive behavior. With that said, I've had 3 rhomboids, a mystery, and a bunch of fairies, leopards, and other wrasses in a 300 for a long time and there is no chasing or aggression at all. Just wait and observe. If necessary, wrasses are generally easy to catch if you have a good trap and patience. Good luck.